Malicious PDF — malware analysis report

Static analysis result for SHA-256 b70379d6f2b9446a…

MALICIOUS

PDF

71.9 KB Created: 2021-09-26 01:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2d967bb1cac779fbb20ed5bd5062459c SHA-1: ec75036d660d0917ea93059c27a05504032f2385 SHA-256: b70379d6f2b9446a609b4187b81c5ba45666eb9d7b8df0e40a3bec523422e147
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple domains, including one hosted on compromised WordPress upload storage, suggesting an attempt to obscure the final destination and evade detection. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/97068108538.pdf In PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/toborifibadixizekuludo.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/xugovorowaroruf.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/pilazovipibimo.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109042047489871.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cddc61f1c3---1676816297.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/wopizobabozunav.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021091522252977.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/goxuri.pdfIn PDF document text
    • http://dalaichau.com/files/33660928958.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210906085234735.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/46349027207.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/a509a81aab45d46b2a34f009ab5eddb5/foteluzusekaxiduletilati.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16147f97a2e493---rixogen.pdfIn PDF document text
    • https://matricula.hssanesteban.cl/files/96298605653.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313ea028280---745014902.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/67463137470.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/61756800819.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/76234690276.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614e11e99c7a0---tobom.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/fokomonajenonowemebad.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/kiwerutoj.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/totepusovizukevija.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=37+best+movie+streaming+sitesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E2 10736 bytes
SHA-256: 7d01514d607959e65f6a004c4b6a897b7491ba342540d362a821e2c18a29a0af
font_01_sfnt_off0000cda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B8 17376 bytes
SHA-256: 787e01470447a634a6dc12e1d9e5c63d4a1b22a593c0cf083fa6dba17bc3de00

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